Support top



FIG. 1 is a front-left perspective view of a support top showing my new design, the left and right halves of which are identical;

FIG. 2 is a rear-right perspective view thereof;

FIG. 3 is a front-left perspective view thereof with the claimed design turned inside out; and

FIG. 4 is a rear-right perspective view thereof with the claimed design turned inside out. 

The ornamental design for a support top, as shown and described. 